CN104030509B

CN104030509B - A kind for the treatment of process of color-forming intermediate H acids factory effluent

Info

Publication number: CN104030509B
Application number: CN201410271457.6A
Authority: CN
Inventors: 赵卫国; 殷文华
Original assignee: TAIXING JINHUI CHEMICAL INDUSTRY Co Ltd
Current assignee: TAIXING JINHUI CHEMICAL INDUSTRY Co Ltd
Priority date: 2014-06-18
Filing date: 2014-06-18
Publication date: 2016-01-13
Anticipated expiration: 2034-06-18
Also published as: CN104030509A

Abstract

The invention discloses a kind for the treatment of process of color-forming intermediate H acids factory effluent, first H acid producing waste water is regulated its pH value to 7 ~ 9, enter MVR device and carry out distillation and concentration process, isolate high temp. salt and high COD concentrated solution and reuse water; Again described high temp. salt and high COD concentrated solution and high-hydroscopicity material are puddled, after drying, at 300 ~ 800 DEG C, carry out cracking charing, obtain containing charcoal and sodium sulfate mixture.Adopt the COD of waste water before and after the wastewater treatment of method process H of the present invention acid to decline significantly, the waste residue of generation can be used as the raw material second stage employ of producing Sodium Sulphide or water glass, while improvement waste water, achieves changing waste into resources and utilizes.

Description

A kind for the treatment of process of color-forming intermediate H acids factory effluent

Technical field

The invention belongs to field of waste water treatment, be specifically related to a kind for the treatment of process of color-forming intermediate H acids factory effluent.

Background technology

H acid is a kind of important dyestuff intermediate, mainly for the production of acid dye, reactive dyestuffs and azoic dyestuff, also can be used for pharmaceutical technology.In production acid out process, the H acid monosodium salt of precipitation, the waste liquid after filtration belongs to the organic waste water of typical high density, high chroma, high salinity, high bio-toxicity.

At present this method of wastewater treatment, seen bibliographical information have wet oxidation process, light urges method, oxidation style, electricity ginseng analyse method etc.But these methods exist equipment complexity respectively, special substance, difficult quality guarantee, medicament is expensive, operational condition is harsh, energy consumption is high and have secondary pollution problem.

Due to H acid waste water salinity and COD too high, therefore effective improvement of this waste water remains a great problem so far.

Summary of the invention

The object of the invention is on the basis of existing technology, a kind for the treatment of process of H acid producing waste water is provided, this law is by the MVR device distillation and concentration of waste water through energy-saving and water-saving, again through low-temperature carbonization, realize non-wastewater discharge, the waste residue containing Sodium sulfate anhydrous.min(99) can be utilized as the raw material producing Sodium Sulphide or water glass.

Object of the present invention can be reached by following measures:

A treatment process for color-forming intermediate H acids factory effluent, is characterized in that comprising the steps:

1) H acid producing waste water is regulated its pH value to 7 ~ 9, enter MVR device and carry out distillation and concentration process, isolate high temp. salt, high COD concentrated solution and reuse water;

2) described high temp. salt and high COD concentrated solution and high-hydroscopicity material are puddled, after drying, at 300 ~ 800 DEG C, carry out cracking charing, obtain containing charcoal and sodium sulfate mixture.

3) high temp. salt directly carries out cracking charing at 300 ~ 800 DEG C, obtains the mixture containing charcoal and sodium sulfate.

In this law the color-forming intermediate H acids factory effluent of indication be H acid production process in separate out H acid monosodium salt and filter after waste liquid, it mainly contains sodium sulfate, H acid and byproduct of reaction (as multiple naphthalene system by product, may containing 2 ~ 3 sulfonic groups and 1 ~ 2 hydroxyl and 1 ~ 2 amino in its structure), the solid content of byproduct of reaction is 4% ~ 8%.Generally, the solid content of H acid producing waste water is 20% ~ 30%, and its COD is 100000 ㎎/L-200000 ㎎/L.

In a kind of preferred version, step 1) in the COD=10000 ~ 30000mg/kg of isolated high temp. salt, the COD=200000 ~ 300000mg/L of high COD concentrated solution, the COD < 500mg/L of reuse water, it is water white transparency shape.

In a kind of preferred version, in step 1), liquid caustic soda can be adopted to regulate the pH value of H acid producing waste water, preferably its pH value is extremely regulated 8.

Distillation and concentration step in step 1) directly can isolate water white transparency and COD is less than the fresh water of 500 ㎎/L, and it can be got back in production and go to apply mechanically.Waste water (comprising high temp. salt) solid content can be made by 22 ~ 25% even lower solid contents that are concentrated into about 50 ~ 65% in distillation and concentration.The temperature of distillation and concentration process is 70 ~ 100 DEG C, preferably 80 ~ 100 DEG C.Adopt MVR vapo(u)rization system in this law, only need propulsion source and a small amount of thermal source, energy-conservationly to economize on water again.The pressure of distillation and concentration process can under 2.0 ~-0.1MPa.

In a kind of preferred version, step 2) in the high-hydroscopicity material that uses can be selected from charcoal, gac, diatomite, rice hull ash etc. one or more.The quality consumption of described high-hydroscopicity material is 20% ~ 80% of described high COD concentrated solution weight, preferably 30% ~ 60%.When puddling, general control moisture content is 20% ~ 60%.

In a kind of preferred version, step 2) the temperature of cracking charing be 500 ~ 700 DEG C, best cracking charred effect can be reached at such a temperature.This law is not strict with cracking carbonization time, is generally 1 ~ 3 hour.Carry out in this law carbonizing the inorganic residues obtained, be mainly the mixture containing charcoal and sodium sulfate, its COD is 200 ㎎/kg-1000 ㎎/kg, and it as the raw material producing Sodium Sulphide or water glass, can not produce secondary pollution.Oven dry and charing can be made in one apparatus to complete together, also can dry and charing be divided into two devices to complete cracking process at a certain temperature.Inorganic residues after cracking charing, according to the difference of used high-hydroscopicity material, also has different compositions and content, but main based on charcoal and sodium sulfate.The COD containing charcoal and sodium sulfate mixture after cracking charing is 200 ㎎/L-1000 ㎎/L.

Adopt the COD of waste water before and after the wastewater treatment of method process H of the present invention acid to decline significantly, the waste residue of generation can be used as the raw material second stage employ of producing Sodium Sulphide or water glass, while improvement waste water, achieves changing waste into resources and utilizes.

Embodiment

Embodiment 1

100mlH acid producing waste water liquid caustic soda is regulated its COD=105800mg/L of PH=8(, containing Sodium sulfate anhydrous.min(99) 21%, by-products content 4.8%), then enter water distilling apparatus and carry out distillation and concentration process at 95-100 DEG C, obtain the distilled water of COD=280mg/L, isolate high temp. salt 15g, the enriched material of residual volume 30ml, add 10 grams of gacs, puddle powdering thing, put into muffle furnace, charing 1-2 hour is carried out at 600 DEG C, waste residue chemical examination COD=560 ㎎/L, main containing Sodium sulfate anhydrous.min(99) 72% and charcoal in waste residue, high temp. salt puts into muffle furnace, charing 1-2 hour is carried out at 600 DEG C, waste residue chemical examination COD=220 ㎎/L, main containing Sodium sulfate anhydrous.min(99) 95% and charcoal in waste residue, the raw material that waste residue can do Sodium Sulphide or water glass carries out second stage employ.

Embodiment 2

100mlH acid producing waste water liquid caustic soda is regulated its COD=125000mg/L of key PH=8(, containing Sodium sulfate anhydrous.min(99) 22%, by-products content 4.3%), then water distilling apparatus is entered at 80-85 DEG C, concentrated under vacuum tightness-0.06MPaG, obtain the distilled water of COD=310mg/L, isolate high temp. salt 14g, the enriched material of residual volume 35ml, add 20 grams of diatomite, puddle powdering thing, put into muffle furnace, charing 1-2 hour is carried out at 700 DEG C, waste residue chemical examination COD=420 ㎎/L, waste residue is containing Sodium sulfate anhydrous.min(99) 60%, charcoal, other material of silicon-dioxide, the raw material that waste residue can do water glass carries out second stage employ.

Claims

1. a treatment process for color-forming intermediate H acids factory effluent, is characterized in that comprising the steps:

1) H acid producing waste water is regulated its pH value to 7 ~ 9, enter MVR device and carry out distillation and concentration process, isolate high temp. salt and high COD concentrated solution and reuse water;

2) described high COD concentrated solution and high-hydroscopicity material are puddled, at 600 ~ 700 DEG C, after drying, carry out cracking charing 1 ~ 2 hour, obtain the mixture containing charcoal and sodium sulfate; Described high-hydroscopicity material is selected from one or more in charcoal, gac, diatomite, rice hull ash; The quality consumption of high-hydroscopicity material is 20% ~ 80% of described high COD concentrated solution weight;

3) high temp. salt directly carries out cracking charing 1 ~ 2 hour at 600 DEG C, obtains the mixture containing charcoal and sodium sulfate.

2. method according to claim 1, is characterized in that in step 1), adopts liquid caustic soda to regulate the pH value of H acid producing waste water.

3. method according to claim 1, is characterized in that in step 1), and H acid producing waste water regulates its pH value to 8; The temperature of distillation and concentration process is 70 ~ 100 DEG C.

4. method according to claim 1, is characterized in that in step 1), and distillation and concentration is to the solid content 50 ~ 65% of waste water.

5. method according to claim 1, is characterized in that in step 1), described reuse water water white transparency and its COD is less than 500 ㎎/L.

6. method according to claim 1, is characterized in that in step 2) in, the described COD containing charcoal and sodium sulfate mixture is 200 ㎎/L-1000 ㎎/L.

7. method according to claim 1, it is characterized in that in step 1), described H acid producing waste water be H acid production process in separate out H acid monosodium salt and filter after waste liquid, it is mainly containing sodium sulfate, H acid and byproduct of reaction, its solid content is 20% ~ 30%, and its COD is 100000 ㎎/L ~ 200000 ㎎/L.